JWindow is a container that can be displayed anywhere on the
* user's desktop. It does not have the title bar, window-management buttons,
* or other trimmings associated with a JFrame, but it is still a
* "first-class citizen" of the user's desktop, and can exist anywhere
* on it.
*
* The JWindow component contains a JRootPane
* as its only child. The contentPane should be the parent
* of any children of the JWindow.
* As a conveniance add and its variants, remove and
* setLayout have been overridden to forward to the
* contentPane as necessary. This means you can write:
*
* window.add(child); ** And the child will be added to the contentPane. * The
contentPane will always be non-null.
* Attempting to set it to null will cause the JWindow
* to throw an exception. The default contentPane will have a
* BorderLayout manager set on it.
* Refer to {@link javax.swing.RootPaneContainer}
* for details on adding, removing and setting the LayoutManager
* of a JWindow.
*
* Please see the {@link JRootPane} documentation for a complete description of
* the contentPane, glassPane, and
* layeredPane components.
*
* In a multi-screen environment, you can create a JWindow
* on a different screen device. See {@link java.awt.Window} for more
* information.
*
* Warning: Swing is not thread safe. For more * information see Swing's Threading * Policy. *
* Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeansTM
* has been added to the java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see JRootPane
*
* @beaninfo
* attribute: isContainer true
* attribute: containerDelegate getContentPane
* description: A toplevel window which has no system border or controls.
*
* @author David Kloba
*/
@SuppressWarnings("serial")
public class JWindow extends Window implements Accessible,
RootPaneContainer,
TransferHandler.HasGetTransferHandler
{
/**
* The JRootPane instance that manages the
* contentPane
* and optional menuBar for this frame, as well as the
* glassPane.
*
* @see #getRootPane
* @see #setRootPane
*/
protected JRootPane rootPane;
/**
* If true then calls to add and setLayout
* will be forwarded to the contentPane. This is initially
* false, but is set to true when the JWindow is constructed.
*
* @see #isRootPaneCheckingEnabled
* @see #setRootPaneCheckingEnabled
* @see javax.swing.RootPaneContainer
*/
protected boolean rootPaneCheckingEnabled = false;
/**
* The TransferHandler for this window.
*/
private TransferHandler transferHandler;
/**
* Creates a window with no specified owner. This window will not be
* focusable.
*
* This constructor sets the component's locale property to the value
* returned by JComponent.getDefaultLocale.
*
* @throws HeadlessException if
* GraphicsEnvironment.isHeadless() returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #isFocusableWindow
* @see JComponent#getDefaultLocale
*/
public JWindow() {
this((Frame)null);
}
/**
* Creates a window with the specified GraphicsConfiguration
* of a screen device. This window will not be focusable.
*
* This constructor sets the component's locale property to the value
* returned by JComponent.getDefaultLocale.
*
* @param gc the GraphicsConfiguration that is used
* to construct the new window with; if gc is null,
* the system default GraphicsConfiguration
* is assumed
* @throws HeadlessException If
* GraphicsEnvironment.isHeadless() returns true.
* @throws IllegalArgumentException if gc is not from
* a screen device.
*
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #isFocusableWindow
* @see JComponent#getDefaultLocale
*
* @since 1.3
*/
public JWindow(GraphicsConfiguration gc) {
this(null, gc);
super.setFocusableWindowState(false);
}
/**
* Creates a window with the specified owner frame.
* If owner is null, the shared owner
* will be used and this window will not be focusable. Also,
* this window will not be focusable unless its owner is showing
* on the screen.
*
* This constructor sets the component's locale property to the value
* returned by JComponent.getDefaultLocale.
*
* @param owner the frame from which the window is displayed
* @throws HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #isFocusableWindow
* @see JComponent#getDefaultLocale
*/
public JWindow(Frame owner) {
super(owner == null? SwingUtilities.getSharedOwnerFrame() : owner);
if (owner == null) {
WindowListener ownerShutdownListener =
SwingUtilities.getSharedOwnerFrameShutdownListener();
addWindowListener(ownerShutdownListener);
}
windowInit();
}
/**
* Creates a window with the specified owner window. This window
* will not be focusable unless its owner is showing on the screen.
* If owner is null, the shared owner
* will be used and this window will not be focusable.
*
* This constructor sets the component's locale property to the value
* returned by JComponent.getDefaultLocale.
*
* @param owner the window from which the window is displayed
* @throws HeadlessException if
* GraphicsEnvironment.isHeadless() returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #isFocusableWindow
* @see JComponent#getDefaultLocale
*/
public JWindow(Window owner) {
super(owner == null ? (Window)SwingUtilities.getSharedOwnerFrame() :
owner);
if (owner == null) {
WindowListener ownerShutdownListener =
SwingUtilities.getSharedOwnerFrameShutdownListener();
addWindowListener(ownerShutdownListener);
}
windowInit();
}
/**
* Creates a window with the specified owner window and
* GraphicsConfiguration of a screen device. If
* owner is null, the shared owner will be used
* and this window will not be focusable.
*
* This constructor sets the component's locale property to the value
* returned by JComponent.getDefaultLocale.
*
* @param owner the window from which the window is displayed
* @param gc the GraphicsConfiguration that is used
* to construct the new window with; if gc is null,
* the system default GraphicsConfiguration
* is assumed, unless owner is also null, in which
* case the GraphicsConfiguration from the
* shared owner frame will be used.
* @throws HeadlessException if
* GraphicsEnvironment.isHeadless() returns true.
* @throws IllegalArgumentException if gc is not from
* a screen device.
*
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #isFocusableWindow
* @see JComponent#getDefaultLocale
*
* @since 1.3
*/
public JWindow(Window owner, GraphicsConfiguration gc) {
super(owner == null ? (Window)SwingUtilities.getSharedOwnerFrame() :
owner, gc);
if (owner == null) {
WindowListener ownerShutdownListener =
SwingUtilities.getSharedOwnerFrameShutdownListener();
addWindowListener(ownerShutdownListener);
}
windowInit();
}
/**
* Called by the constructors to init the JWindow properly.
*/
protected void windowInit() {
setLocale( JComponent.getDefaultLocale() );
setRootPane(createRootPane());
setRootPaneCheckingEnabled(true);
sun.awt.SunToolkit.checkAndSetPolicy(this);
}
/**
* Called by the constructor methods to create the default
* rootPane.
*/
protected JRootPane createRootPane() {
JRootPane rp = new JRootPane();
// NOTE: this uses setOpaque vs LookAndFeel.installProperty as there
// is NO reason for the RootPane not to be opaque. For painting to
// work the contentPane must be opaque, therefor the RootPane can
// also be opaque.
rp.setOpaque(true);
return rp;
}
/**
* Returns whether calls to add and
* setLayout are forwarded to the contentPane.
*
* @return true if add and setLayout
* are fowarded; false otherwise
*
* @see #addImpl
* @see #setLayout
* @see #setRootPaneCheckingEnabled
* @see javax.swing.RootPaneContainer
*/
protected boolean isRootPaneCheckingEnabled() {
return rootPaneCheckingEnabled;
}
/**
* Sets the {@code transferHandler} property, which is a mechanism to
* support transfer of data into this component. Use {@code null}
* if the component does not support data transfer operations.
*
* If the system property {@code suppressSwingDropSupport} is {@code false} * (the default) and the current drop target on this component is either * {@code null} or not a user-set drop target, this method will change the * drop target as follows: If {@code newHandler} is {@code null} it will * clear the drop target. If not {@code null} it will install a new * {@code DropTarget}. *
* Note: When used with {@code JWindow}, {@code TransferHandler} only * provides data import capability, as the data export related methods * are currently typed to {@code JComponent}. *
* Please see
*
* How to Use Drag and Drop and Data Transfer, a section in
* The Java Tutorial, for more information.
*
* @param newHandler the new {@code TransferHandler}
*
* @see TransferHandler
* @see #getTransferHandler
* @see java.awt.Component#setDropTarget
* @since 1.6
*
* @beaninfo
* bound: true
* hidden: true
* description: Mechanism for transfer of data into the component
*/
public void setTransferHandler(TransferHandler newHandler) {
TransferHandler oldHandler = transferHandler;
transferHandler = newHandler;
SwingUtilities.installSwingDropTargetAsNecessary(this, transferHandler);
firePropertyChange("transferHandler", oldHandler, newHandler);
}
/**
* Gets the transferHandler property.
*
* @return the value of the transferHandler property
*
* @see TransferHandler
* @see #setTransferHandler
* @since 1.6
*/
public TransferHandler getTransferHandler() {
return transferHandler;
}
/**
* Calls paint(g). This method was overridden to
* prevent an unnecessary call to clear the background.
*
* @param g the Graphics context in which to paint
*/
public void update(Graphics g) {
paint(g);
}
/**
* Sets whether calls to add and
* setLayout are forwarded to the contentPane.
*
* @param enabled true if add and setLayout
* are forwarded, false if they should operate directly on the
* JWindow.
*
* @see #addImpl
* @see #setLayout
* @see #isRootPaneCheckingEnabled
* @see javax.swing.RootPaneContainer
* @beaninfo
* hidden: true
* description: Whether the add and setLayout methods are forwarded
*/
protected void setRootPaneCheckingEnabled(boolean enabled) {
rootPaneCheckingEnabled = enabled;
}
/**
* Adds the specified child Component.
* This method is overridden to conditionally forward calls to the
* contentPane.
* By default, children are added to the contentPane instead
* of the frame, refer to {@link javax.swing.RootPaneContainer} for
* details.
*
* @param comp the component to be enhanced
* @param constraints the constraints to be respected
* @param index the index
* @exception IllegalArgumentException if index is invalid
* @exception IllegalArgumentException if adding the container's parent
* to itself
* @exception IllegalArgumentException if adding a window to a container
*
* @see #setRootPaneCheckingEnabled
* @see javax.swing.RootPaneContainer
*/
protected void addImpl(Component comp, Object constraints, int index)
{
if(isRootPaneCheckingEnabled()) {
getContentPane().add(comp, constraints, index);
}
else {
super.addImpl(comp, constraints, index);
}
}
/**
* Removes the specified component from the container. If
* comp is not the rootPane, this will forward
* the call to the contentPane. This will do nothing if
* comp is not a child of the JWindow or
* contentPane.
*
* @param comp the component to be removed
* @throws NullPointerException if comp is null
* @see #add
* @see javax.swing.RootPaneContainer
*/
public void remove(Component comp) {
if (comp == rootPane) {
super.remove(comp);
} else {
getContentPane().remove(comp);
}
}
/**
* Sets the LayoutManager.
* Overridden to conditionally forward the call to the
* contentPane.
* Refer to {@link javax.swing.RootPaneContainer} for
* more information.
*
* @param manager the LayoutManager
* @see #setRootPaneCheckingEnabled
* @see javax.swing.RootPaneContainer
*/
public void setLayout(LayoutManager manager) {
if(isRootPaneCheckingEnabled()) {
getContentPane().setLayout(manager);
}
else {
super.setLayout(manager);
}
}
/**
* Returns the rootPane object for this window.
* @return the rootPane property for this window
*
* @see #setRootPane
* @see RootPaneContainer#getRootPane
*/
public JRootPane getRootPane() {
return rootPane;
}
/**
* Sets the new rootPane object for this window.
* This method is called by the constructor.
*
* @param root the new rootPane property
* @see #getRootPane
*
* @beaninfo
* hidden: true
* description: the RootPane object for this window.
*/
protected void setRootPane(JRootPane root) {
if(rootPane != null) {
remove(rootPane);
}
rootPane = root;
if(rootPane != null) {
boolean checkingEnabled = isRootPaneCheckingEnabled();
try {
setRootPaneCheckingEnabled(false);
add(rootPane, BorderLayout.CENTER);
}
finally {
setRootPaneCheckingEnabled(checkingEnabled);
}
}
}
/**
* Returns the Container which is the contentPane
* for this window.
*
* @return the contentPane property
* @see #setContentPane
* @see RootPaneContainer#getContentPane
*/
public Container getContentPane() {
return getRootPane().getContentPane();
}
/**
* Sets the contentPane property for this window.
* This method is called by the constructor.
*
* @param contentPane the new contentPane
*
* @exception IllegalComponentStateException (a runtime
* exception) if the content pane parameter is null
* @see #getContentPane
* @see RootPaneContainer#setContentPane
*
* @beaninfo
* hidden: true
* description: The client area of the window where child
* components are normally inserted.
*/
public void setContentPane(Container contentPane) {
getRootPane().setContentPane(contentPane);
}
/**
* Returns the layeredPane object for this window.
*
* @return the layeredPane property
* @see #setLayeredPane
* @see RootPaneContainer#getLayeredPane
*/
public JLayeredPane getLayeredPane() {
return getRootPane().getLayeredPane();
}
/**
* Sets the layeredPane property.
* This method is called by the constructor.
*
* @param layeredPane the new layeredPane object
*
* @exception IllegalComponentStateException (a runtime
* exception) if the content pane parameter is null
* @see #getLayeredPane
* @see RootPaneContainer#setLayeredPane
*
* @beaninfo
* hidden: true
* description: The pane which holds the various window layers.
*/
public void setLayeredPane(JLayeredPane layeredPane) {
getRootPane().setLayeredPane(layeredPane);
}
/**
* Returns the glassPane Component for this window.
*
* @return the glassPane property
* @see #setGlassPane
* @see RootPaneContainer#getGlassPane
*/
public Component getGlassPane() {
return getRootPane().getGlassPane();
}
/**
* Sets the glassPane property.
* This method is called by the constructor.
* @param glassPane the glassPane object for this window
*
* @see #getGlassPane
* @see RootPaneContainer#setGlassPane
*
* @beaninfo
* hidden: true
* description: A transparent pane used for menu rendering.
*/
public void setGlassPane(Component glassPane) {
getRootPane().setGlassPane(glassPane);
}
/**
* {@inheritDoc}
*
* @since 1.6
*/
public Graphics getGraphics() {
JComponent.getGraphicsInvoked(this);
return super.getGraphics();
}
/**
* Repaints the specified rectangle of this component within
* time milliseconds. Refer to RepaintManager
* for details on how the repaint is handled.
*
* @param time maximum time in milliseconds before update
* @param x the x coordinate
* @param y the y coordinate
* @param width the width
* @param height the height
* @see RepaintManager
* @since 1.6
*/
public void repaint(long time, int x, int y, int width, int height) {
if (RepaintManager.HANDLE_TOP_LEVEL_PAINT) {
RepaintManager.currentManager(this).addDirtyRegion(
this, x, y, width, height);
}
else {
super.repaint(time, x, y, width, height);
}
}
/**
* Returns a string representation of this JWindow.
* This method
* is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be null.
*
* @return a string representation of this JWindow
*/
protected String paramString() {
String rootPaneCheckingEnabledString = (rootPaneCheckingEnabled ?
"true" : "false");
return super.paramString() +
",rootPaneCheckingEnabled=" + rootPaneCheckingEnabledString;
}
/////////////////
// Accessibility support
////////////////
/** The accessible context property. */
protected AccessibleContext accessibleContext = null;
/**
* Gets the AccessibleContext associated with this JWindow.
* For JWindows, the AccessibleContext takes the form of an
* AccessibleJWindow.
* A new AccessibleJWindow instance is created if necessary.
*
* @return an AccessibleJWindow that serves as the
* AccessibleContext of this JWindow
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJWindow();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* JWindow class. It provides an implementation of the
* Java Accessibility API appropriate to window user-interface
* elements.
*/
@SuppressWarnings("serial")
protected class AccessibleJWindow extends AccessibleAWTWindow {
// everything is in the new parent, AccessibleAWTWindow
}
}